Abraham K.G., Maitland A., Bianchi S.M. (2006) Nonresponse in the American Time Use Survey: Who Is Missing from the Data and How Much Does It Matter? International Journal of Public Opinion Quarterly. Vol. 70. No 5: 676–703.

Callegaro M., Poggio T. (2004) Where Can I Call You? The “Mobile (Phone) Revolution” and Its Impact on Survey Research and Coverage Error: a Discussion of the Italian Case. In: 6th International Conference on Logic and Methodology. Amsterdam, Netherlands, 16–20 August.

Roe D.J., Currivan D.B. (2006) Using Dual-Frame Sample Designs to Increase the Efficiency of Reaching General Populations and Population Subgroups in Telephone Surveys In: Second International Conference on Telephone Survey Methodology. Miami, FL.